Throttle staying open?

[alinton]

Hi, When I change up under acceleration, the revs fly up when I declutch, instead of dropping off like they should.

(Yes, I do remember to come off the pedal as I change!)

If I keep the clutch down, the revs stay up for a few seconds then slowly drop down.

It doesn't look as if the throttle cable is sticking, so any ideas what might cause this please?

Ta

Andy.

[FUBAR]

This is spooky. Ive just yesterday reported similar to Austec, but mine seems to stick for a second if Im around the 3k rpm mark. If I rev way past that I have no issues, just seems to be on part throttle around 3k. Its going in next week to be looked at.

[alinton]

Yep its kinda similar. About 3.5 - 4k, beyond that its fine.

Please let me know what you find out!

Thanks - Andy.

[Nicholas Blair]

I get it too, only under pretty hard driving though.

TBH, learnt to live with it, which probably isn't the best thing to do.

[Scrooloose]

I had this. Took me a while to find out what it was...

There is a rod through each set of throttle bodies which has the butterflies on. On the end of each rod is a return spring (not the one attached to the throttle linkage). If even one of these springs breaks, causes the problem as described.

It took me forever to find someone who could get them as replacement parts. That someone was Peninsular.....

They're pretty easy to change.

[DonnyMac]

Scrooloose said:

I had this. Took me a while to find out what it was...

There is a rod through each set of throttle bodies which has the butterflies on. On the end of each rod is a return spring (not the one attached to the throttle linkage). If even one of these springs breaks, causes the problem as described.

It took me forever to find someone who could get them as replacement parts. That someone was Peninsular.....

They're pretty easy to change.

Yep, that was the answer for me too last year, I missed Fighting Torque because of a tiny spring! I now have two return springs.

You can get them delivered from CT for under a fiver - fixed in about the same time it takes to open the envelope.

[alinton]

I don't think its that with mine, the end springs look ok, and I have the extra spring mod fitted too.

A.

[julian64]

Sticking cable, throttle return spring, springs within the throttle shaft, or my personal favourite, stuck butterfly rod.

[thegreengoblet]

DonnyMac said:

Scrooloose said:

I had this. Took me a while to find out what it was...

There is a rod through each set of throttle bodies which has the butterflies on. On the end of each rod is a return spring (not the one attached to the throttle linkage). If even one of these springs breaks, causes the problem as described.

It took me forever to find someone who could get them as replacement parts. That someone was Peninsular.....

They're pretty easy to change.

Yep, that was the answer for me too last year, I missed Fighting Torque because of a tiny spring! I now have two return springs.

You can get them delivered from CT for under a fiver - fixed in about the same time it takes to open the envelope.

Same here. Mine had snapped and jammed in. It actually cost me 3 trips to the Indie (and a fair amount of cash in the process - changing other bits) before it was found. What was strange was that she always behaved herself for an hour or so's worth of driving after it had been in to the Indie??

[Scrooloose]

thegreengoblet said:

DonnyMac said:

Scrooloose said:

I had this. Took me a while to find out what it was...

There is a rod through each set of throttle bodies which has the butterflies on. On the end of each rod is a return spring (not the one attached to the throttle linkage). If even one of these springs breaks, causes the problem as described.

It took me forever to find someone who could get them as replacement parts. That someone was Peninsular.....

They're pretty easy to change.

Yep, that was the answer for me too last year, I missed Fighting Torque because of a tiny spring! I now have two return springs.

You can get them delivered from CT for under a fiver - fixed in about the same time it takes to open the envelope.

Same here. Mine had snapped and jammed in. It actually cost me 3 trips to the Indie (and a fair amount of cash in the process - changing other bits) before it was found. What was strange was that she always behaved herself for an hour or so's worth of driving after it had been in to the Indie??

Mine changed with temperature too.

The other thing you could try is to take the hoses off and re-centre the butterflies in the throttle body. It could be one or more of those sticking....

[Buffoon]

Sorry I can't picture the return springs at the moment, but if they are similar to my E-Type there is possible friction between coils due to corrosion. Oiling will not cure, but liberal coating of ASP does the job.

Of course, if it is not a torsional spring but a compression spring, this info will be useless to anyone who has not got an E-Type or Triumph.

[alinton]

Scrooloose said:

Same here. Mine had snapped and jammed in. It actually cost me 3 trips to the Indie (and a fair amount of cash in the process - changing other bits) before it was found. What was strange was that she always behaved herself for an hour or so's worth of driving after it had been in to the Indie??

Hmm, mine does that too. drives fine for an hour or so.

Right, a damn good inspection is on the cards tomorrow (If it stops bleedin' raining).

Thanks for the pointers guys!

A.